Super Tiny Size – Its compact size allows it to be installed in various mounting boxes, including the smallest European standard. External Switch Control – Easily connect to the momentary switch, door exit switch, SPDT switch, latching switch, and even dry contact sensors. Detach Relay Mode – MINIR4 has “detach relay” mode, which means the states of the external switches and relay are separated, so operating the external switch button won’t affect the relay state. eWeLink-Remote Control – MINIR4 is a smart switch with the gateway function of “eWeLink-Remote”. You can add “eWeLink-Remote” sub-devices, R5 and S-MATE, after pairing with MINIR4. Both R5 and S-MATE can act as remote controllers to control MINIR4 locally through the eWeLink-Remote signal. Safe & Reliable – TÜV, CE, and FCC certifications ensure a safer and more reliable product. SPECIFICATIONS: Brand: SONOFF Model: MINIR4 Wi-Fi: IEEE 802.11b/g/n 2.4GHz Input: 100-240V~50/60Hz 10A Max Output: 100-240V~50/60Hz 10A Max Casing Material: PC V0 Dimension: 39.5x33x16.8mm SKU: SONOFF-MINIR4